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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >GPS Near-Real-Time Coseismic Displacements for the Great Tohoku-oki Earthquake
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GPS Near-Real-Time Coseismic Displacements for the Great Tohoku-oki Earthquake

机译：GPS东北大地震地震的近实时地震位移

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摘要

Here, we present the application to the great Tohoku-oki (Japan) earthquake (United States Geological Survey $M = 9.0$, March 11, 2011, 05:46:24 Coordinated Universal Time) of a novel approach, named Variometric Approach for Displacements Analysis Stand-Alone Engine, able to estimate accurate coseismic displacements and waveforms in real time, in the global reference frame, just using the standard broadcast products (orbits and clocks) and the high-rate (1 Hz or more) carrier phase observations continuously collected by a stand-alone global-positioning-system receiver. We processed separately the data collected at MIZU (Mizusawa, 140 km from the epicenter) and USUD (Usuda, 430 km from the epicenter) International Global Navigation Satellite System Service sites. A total horizontal displacement of about 2.4 m east–southeast was estimated for the MIZU, with a maximum horizontal oscillation amplitude of about 3.4 m along the same direction. Generally, an overall accuracy better than 10 cm for all the components (east, north, and up) and an average accuracy around 5 cm were assessed over an interval shorter than 5 min, with respect to independent solutions obtained with two different scientific software. The threshold of 5-cm accuracy has been recently indicated as sufficient for real-time fault determination for near-field tsunami forecasting for a major earthquake, like the 2011 Tohoku-oki one.
机译：在这里，我们介绍了一种名为Variometric Approach for Variometric Approach的新颖方法在日本东北大地震（美国地质调查局$ M = 9.0 $，2011年3月11日，协调世界时）的应用。位移分析独立引擎，仅使用标准广播产品（轨道和时钟）和高速率（1 Hz或更高）载波相位观测值，即可在全局参考帧中实时估计准确的同震位移和波形由独立的全球定位系统接收器连续收集。我们分别处理了在MIZU（水震，距震中140公里）和USUD（Usuda，距震中430公里）国际全球导航卫星系统服务站点收集的数据。据估计，MIZU的东西向总水平位移约为2.4 m，沿同一方向的最大水平振荡幅度约为3.4 m。通常，对于使用两个不同的科学软件获得的独立解决方案，在少于5分钟的间隔内评估了所有组件（东部，北部和北部）的整体精度优于10 cm，平均精度约为5 cm。最近已指出，精度为5厘米的阈值足以实时确定大地震的近场海啸，例如2011年的东北冲地震。

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